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Conference object . 2019
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Towards Measuring Intonation Quality of Choir Recordings: A Case Study on Bruckner's Locus Iste

Authors: Weiss, Christof; Schlecht, Sebastian J.; Rosenzweig, Sebastian; Müller, Meinard;

Towards Measuring Intonation Quality of Choir Recordings: A Case Study on Bruckner's Locus Iste

Abstract

Unaccompanied vocal music is a central part of Western art music, yet it requires excellent skills for singers to achieve proper intonation. In this paper, we analyze intonation deficiencies by introducing an intonation cost measure that can be computed from choir recordings and may help to assess the singers' intonation quality. With our approach, we measure the deviation between the recording's local salient frequency content and an adaptive reference grid based on the equal-tempered scale. The adaptivity introduces invariance of the local intonation measure to global intonation drifts. In our experiments, we compute this measure for several recordings of Anton Bruckner's choir piece Locus Iste. We demonstrate the robustness of the proposed measure by comparing scenarios of different complexity regarding the availability of aligned scores and multi-track recordings, as well as the number of singers per part. Even without using score information, our cost measure shows interesting trends, thus indicating the potential of our method for real-world applications.

19 references, page 1 of 2

2 https://www.celemony.com 3 Philharmonia Vocalensemble Stuttgart (Profil Medien 2006), Chor des Bayerischen Rundfunks (Decca 2012), Choir of St John's College Cambridge (Classic Mania 2007), NDR Chor Hamburg (Carus 2015) 4 Internet Archive, https://archive.org/details/LocusIste [11] Johanna Devaney, Jonathan Wild, and Ichiro Fujinaga. Intonation in solo vocal performance: A study of semitone and whole tone tuning in undergraduate and professional sopranos. In Proceedings of the International Symposium on Performance Science, pages 219-224, Toronto, Canada, 2011.

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[17] David M. Howard, Helena Daffern, and Jude Brereton. Four-part choral synthesis system for investigating intonation in a cappella choral singing. Logopedics Phoniatrics Vocology, 38(3):135-142, 2013.

[18] Jong Wook Kim, Justin Salamon, Peter Li, and Juan Pablo Bello. Crepe: A convolutional representation for pitch estimation. In Proceedings of the IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), pages 161-165, Calgary, Canada, 2018.

[19] Bernhard Lehner, Jan Schlüter, and Gerhard Widmer. Online, loudness-invariant vocal detection in mixed music signals. IEEE/ACM Transactions on Audio, Speech & Language Processing, 26(8):1369-1380, 2018.

[20] Matthias Mauch and Simon Dixon. pYIN: A fundamental frequency estimator using probabilistic threshold distributions. In IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), pages 659-663, Florence, Italy, 2014.

[21] Matthias Mauch, Klaus Frieler, and Simon Dixon. Intonation in unaccompanied singing: Accuracy, drift, and a model of reference pitch memory. Journal of the Acoustical Society of America, 136(1):401-411, 2014.

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